<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">商品管理</a></el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告提示 -->
      <el-alert
        title="注意: 只允许为第三类分类设置相关参数!"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类: </span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            :options="cateList"
            :props="cateProps"
            v-model="selectedCatekeys"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >动态参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableDate" border stripe>
            <!-- 展开项 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag文本框 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 文本框与tag的切换 -->
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加参数的按钮 --><el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >静态属性</el-button
          >
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableDate" border stripe>
            <!-- 展开项 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag文本框 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 文本框与tag的切换 -->
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加动态参数会话框区域 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 添加编辑修改会话框区域 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //  商品分类列表
      cateList: [],
      //  级联选择框数据双向绑定到的数组
      selectedCatekeys: [],
      //   配置级联选择器
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true
      },
      //  被激活的标签页名称
      activeName: 'many',
      //   动态数据
      manyTableDate: [],
      //  静态数据
      onlyTableDate: [],
      //  动态参数添加会话框的显示与隐藏
      addDialogVisible: false,
      //  添加参数的表单数据对象
      addForm: {
        attr_name: '',
        attr_sel: 'titleText'
      },
      //  添加的参数验证规则
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      //  编辑对话框的显示与隐藏
      editDialogVisible: false,
      //  编辑对话框的参数对象
      editForm: {
        attr_name: ''
      },
      //  编辑会话框的规则
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //  获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    //  级联选择框	选中项发生变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //  点击tab页签点击事件处理函数
    handleTabClick() {
      this.getParamsData()
    },
    //  获取参数列表数据
    async getParamsData() {
      if (this.selectedCatekeys.length !== 3) {
        this.selectedCatekeys = []
        this.manyTableDate = []
        this.onlyTableDate = []
      }
      //   console.log(this.selectedCatekeys)
      //   根据所选分类的id和当前所选中面板，获取对应的数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品数据列表失败！！！')
      }
      console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //  给每一列数据添加文本框显示与隐藏
        item.inputVisible = false
        //  绑定文本框中输入的值
        item.inputValue = ''
      })
      //  判断获取到的数据是动态还是静态
      if (this.activeName === 'many') {
        this.manyTableDate = res.data
      } else {
        this.onlyTableDate = res.data
      }
    },
    //  监听添加参数对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //  提交表单数据进行预校验
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //  监听编辑对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //  点击编辑按钮弹出会话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('编辑参数失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //  编辑对话框的表单预校验
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('提交编辑失败')
        }
        this.$message.success('修改成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //  根据id删除对应的参数项
    async removeParams(id) {
      const confirmResult = await this.$confirm(
        '此操作将删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消操作')
      }

      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败')
      }
      this.$message.success('删除成功')
      this.getParamsData()
    },
    //  文本框失去焦点，或者按下enter会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //  如果没有return，则证明输入的内容合法，需要做后续操作
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //   需要发起请求保存数据
      this.saveAttrvals(row)
    },
    //  显示文本框，点击按钮
    //  nextTick 方法的作用，就是当页面上的元素被重新渲染后，才会指定回调函数中的代码
    //  也就是当点击tag时，可能页面还没冲tag渲染为文本框，所以等页面元素重新
    //  渲染完毕后，才折行该函数。
    showInput(row) {
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //  抽离tag请求事件
    async saveAttrvals(row) {
      //  需要发起请求保存数据
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!!!')
      }
      this.$message.success('修改参数项成功')
    },
    // 监听tag的关闭事件
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrvals(row)
    }
  },
  //   添加计算属性返回布尔值
  computed: {
    isBtnDisabled() {
      if (this.selectedCatekeys.length !== 3) {
        return true
      }
      return false
    },
    //  选中第三级分类的id
    cateId() {
      if (this.selectedCatekeys.length === 3) {
        return this.selectedCatekeys[2]
      }
      return null
    },
    //  动态计算标题文本、
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态参数'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin-right: 15px;
}
.input-new-tag {
  width: 120px;
}
</style>
